Question

Java Language Only

Use Java FX

In this project we will build a BMI calculator. BMI is calculated using the following formulas:

Measurement Units	Formula and Calculation
Kilograms and meters (or centimetres)	Formula: weight (kg) / [height (m)]2 The formula for BMI is weight in kilograms divided by height in meters squared. If height has been measured in centimetres, divide by 100 to convert this to meters.
Pounds and inches	Formula: 703 x weight (lbs) / [height (in)]2 When using English measurements, pounds should be divided by inches squared. This should then be multiplied by 703 to convert from lbs/inches2 to kg/m2.

Please update the BMIController.java file. Only modify the changeUnits and calculateResult methods.

BMI Controller code below:

package bmi;

import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.RadioButton;
import javafx.scene.control.TextField;

public class BMIController {
   @FXML
    private Button calculate;

    @FXML
    private Label heightLBL;
    @FXML
    private Label result;
    @FXML
    private Label weightLBL;

    @FXML
    private RadioButton us;
    @FXML
    private RadioButton metric;

    @FXML
    private TextField weightTF;
    @FXML
    private TextField heightTF;

    @FXML
    public void changeUnits(ActionEvent event) {
        //This method should update the labels to display correct unites
    }

    @FXML
    public void calculateResult(ActionEvent event) {
        // This method should calculate the BMI

    }
}

Answer 1

HI,

please find the code below.

@FXML
public void changeUnits(ActionEvent event)
{
//This method should update the labels to display correct unites
if(metric.isSelected())
{
weightLBL.setText(String.format("%.2f Metric System",w));
heightLBL.setText(String.format("%.2f Metric System",h));
}
else if(us.isSelected())
{
weightLBL.setText(String.format("%.2f US System",w));
heightLBL.setText(String.format("%.2f US System",h));
}
}

@FXML
public void calculateResult(ActionEvent event)
{
try
{
Double w = new Double(weight.getText());
Double h = new Double(height.getText());
//weight.setText(String.format("%.2f",w));
//height.setText(String.format("%.2f",h));
Double bmi;

if(metric.isSelected())
{
bmi = (w * 703.0)/(h*h);
result.setText(String.format("%.2f",bmi));
}
else if(us.isSelected())
{
bmi = w /(h*h);
result.setText(String.format("%.2f",bmi));
}
}catch(NumberFormatException nf)
{
weightTF.setText("Enter valid value");
weightTF.selectAll();
weightTF.requestFocus();
heightTF.setText("Enter valid value");
heightTF.selectAll();
}
}

thanks,

kindly upvote